//
//  UIViewController+BackButtonHandler.h
//  HandheldELearn
//   系统返回按钮的事件
//  Created by 陈武琦 on 16/7/21.
//  Copyright © 2016年 陈武琦. All rights reserved.
//




#import <UIKit/UIKit.h>
@protocol BackButtonHandlerProtocol <NSObject>
@optional
// Override this method in UIViewController derived class to handle 'Back' button click
-(BOOL)navigationShouldPopOnBackButton;
@end
@interface UIViewController (BackButtonHandler)<BackButtonHandlerProtocol>

@end
